On 12-12-2021 15:19, Florian Klämpfl via fpc-devel wrote: > > What -Cp/-Cf option do you use? To compile FPC: set CPUOPTS=-O2 -Opcoreavx -Cpcoreavx set CPUOPTS64=-Cfavx I didn't enter those in Lazarus I think, so that should be pretty much default.